Light emitting diode backlight, liquid crystal display and driving method

Abstract

The invention provides a light emitting diode backlight, a liquid crystal display and a driving method, wherein the light emitting diode backlight comprises at least one light emitting array and a driving circuit, wherein the at least one light emitting array is connected in parallel between a first terminal and a second terminal, and is composed of a plurality of serial light emitting units, wherein the light emitting units are composed of two reversely parallel light emitting diodes; the driving circuit is used for providing voltage difference between the first terminal and the second terminal so as to emit light to a forward light emitting diode or a reverse light emitting diode in the light emitting array; the driving circuit comprises a time sequence signal input end for receiving and controlling the time sequence control signals of light emitting time of the forward light emitting diode and the reverse light emitting diode. According to the invention, the ESD (electronic static discharge) resistant function can be realized, and the brightness and uniformity of the backlight can be improved.

Description

technical field [0001] The invention relates to a backlight source technology of a liquid crystal display, in particular to a light emitting diode backlight source, a liquid crystal display and a driving method. Background technique [0002] Existing liquid crystal displays can use Light Emitting Diodes (Light Emitting Diode, LED for short) as their backlight sources, which mainly include side-lit type and direct-lit type. The existing LED backlight is a point light source. In the edge-lit backlight, a plurality of LEDs are adjacently arranged on a straight line; in the direct-lit backlight, a plurality of LEDs are evenly arranged on a plane. . [0003] Such as figure 1 As shown, the existing LED backlight is an electrostatic sensitive component. When subjected to excessive reverse high voltage, such as the occurrence of electrostatic discharge (Electrical Static Discharge, ESD for short) and electrical over stress (Electrical Over Stress, EOS for short), ) and so on, sin...

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Problems solved by technology

but figure 2 The disadvantage of the circuit shown is: since the zener diode only plays the role of electrostatic protection in the circuit and does not emit light, if each LED is connected in parallel with a zener diode for electrostatic protection, the cost of the protection circuit will be increased, and, Since half of the diode devices in the backlight do not have the effect of emitting light, it is prone to firefly defects

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